Process of extracting ammonia from gases.



No. 824,092. PATBVNTBD .JUNE 2O, 1906.

a. BRUNOK.

PROOBSS O1?- EXTRAOTINO AMMONIA PROM GASES.

APPLICATION FILED NOK/{18} 1904.

T` @7522? MQ??? 23724756@- 0?. MAY.

UNITED sTATEs 'PATENT-l clarion.`

RUDOLPH BRUNGK, or DORTMUND?enRwLANr PnocEss or lraxiwailcruac-z. AMMONIA Fno'm @.Asras.1

To all whom it may concern,.-

Be it known that I; RUDOLPH BRUNoK,

doctor of philosophy, a subject of the King of Bavaria, residing at Dortmund, Kingdom of i Prussia, German Empire, (and whose postoice address is No. 1,4 Prinz Friedrich Carl strasse, Dortmund have invented a new and useul Process of Extracting `Ammonia from Distillation-Gases;-and Ido hereby declare Io that the following is a full, clear, 'and exact description of my invention, which will len. able others skilled in the-art to which it ap.-

pertains to make and use the same.

This invention relates to the extractiony of v ammonia 'and compounds thereof from the gases evolved during the dry distillation of coal, brown coal, wood, peat,fand other substances, saidgases being acted upon intheir raw and hot state'with concentrated acid im-V zo mediately after paratus. According to a prior invention of minefdef caving the distillation apscribed in United. States Letters Patent No. 773,784, November ,1, v1904', 'the raw l5.11ctv gases are conducted throughl concen- Vthe period of contact between the gas and` 3 5 theacidbeing rather short.

It is the pu ose .of m present invention todo away wirtithis de ciency, and to .this end it essentiallyconsists in proceeding as follows: The raw and hotgases are washed with 4o concentrated' acidfor instance, sulfuric c acid-in a closed scrubber or other kind of' .closed washer, whereby the gas is caused t'o l''meetthe acid liiicounter-current. The washl ingoperaiii'Q11 sc conducted thata'concentained inthe acid, deposits of ammonia salt in the washer being avoided, so 'that all of the ammonia absorbed is retained in the outilowing hot liquor.

ture within the washer or the quantity of acid-used or thespeedl with which the .acid is caused to pass through the washer, asis. well known to thoseskilled in the art of treating 5 5 gases with liquid. The outlowing hot liquor lisl received in a, rerigerating apparatus or specication 'of Letters Patent. Application mea November 18,1904. seria No. 233.337.

4at the top through the outlet-opening 3.- The two coolers 5 and 5a are shown.`

pipes and 8 t with a cock 10.- From th 'suction side of`al` This may easily be .5o reached by properly adjusting the tempera- Patented June 26, 1906.

cooler, Where it is cooled to sucha degree that allor most of the ammonia salt is caused to separate from theI acid and t`o settle on the bottom. The overplus `of acid is drawn ofi 6o `by means of a pump and raised back on the washer. At a suitable point fresh acid is added to compensate the amount of acid absorbed by the ammonia. It is preferred to 1 carry out the describedprocess by the aid of A `a series of'cooler's which are alternately connected with the. scrubber or other vclosed washer, so that the process can be carried out on the continuous-acting system.

On the annexed sheet of drawings is illustrated one combination ofapparatus adapted for my present invention, Figure 1 being a .vertical central section, and Fig. 2 a plan'.y

1 is a scrubber of well-known construe-- tion,where by theabsorbing acid is caused to 7 5 form a series lof su erposed showers. The

' raw and hot distillation-gas enters the scrubber through the inlet-opening 2 at the bottom of same, and the washed gas escapes solution of acid andammonia salt formed collects in the bottom part of the scrubberv and'is conducted through pipe 4 into one of' a series of open coolers.- In the drawings 5 is connected with the supplypi e 4through a pipe 6, having a cock 7, an t e c'oblelga is connected with said'.supply-pipe-throu li".`r

a pipe 8, having a cock ,."Between t e e supply pipe 'is provided 9:9

pump 11 are branched o two pi es 12 and-\- 13, of which pipe 12, hav` ga coc 14, communicates with the cooler 5,i andpipellB,`

havingacock 15, communicates' with. *the .95-

cooler 5a. .4 l

Supposing the cocks 10,A 14, and 9 to'be.y closed and the cocks 7 'and 15 to b` opened,

with this adjustment of said .cocks the cooler Y 5v vyillbe supplied with liquor from the scrubroo ber 1',`wl1ile -acid is drawn from the cooler 5 by the pump l1 and raised back on the top of said scrubber. When the cooler 5 is filled with liquor, cocks 7 and 15\are closed and cocks 10, 14, and 9 opened'. \Fresh liquor 105 e passes from the scrubber into the cooler, and acid is drawn from the cooler 5 and raised back on the top of the scrubber. When cooler 5UL is iilled again, the said cocks are reverted to their former position, and so on.l uo The salt deposited in the coolers is baled out at suitable intervals.

The 0001er Itis evident to those skilled in the artthat' many other combinations of apparatus Amay be used'for carrying out the present iiivention, which .therefore `does -notlreside in #the 5 apparatus, but in the mode of operation, `as

described.

What I claim as my invention Vis- The herein-described process for the extraction .of ammonia `from gases evolved in the 1o :dry-distillation' Y rocess which consists .in washing Ithe rawE o t gases Witheoncentrated ,acid in'a scrubber, regulating the absorption IleSSeS.

,y RUDOLPH BRUN CK. Witnesses:

PETER LIEBER, Winn-IAM EssENWfErN. 

